## Set up incidence matrix for this graph
## B -> C
## B -> D
## C -> A
## D -> A
tOmeg <- matrix(c(1,0,1,1,
0,1,0,0,
0,1,1,0,
0,1,0,1), 4,4, byrow=TRUE,
dimnames=list(c("A","B","C","D"),c("A","B","C","D")))
topsort(tOmeg)
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